This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 25 |
| 3 | 406 |
| 4 | 6478 |
| 5 | 103249 |
| 6 | 1645513 |
| 7 | 26224966 |
| 8 | 417953950 |
| 9 | 6661038241 |
| 10 | 106158657913 |
| 11 | 1691877488374 |
| 12 | 26963881156078 |
| 13 | 429730221008881 |
| 14 | 6848719654986025 |
| 15 | 109149784258767526 |
| 16 | 1739547828485294398 |
| 17 | 27723615471505942849 |
| 18 | 441838299715609791193 |
| 19 | 7041689179978250716246 |